how to diagnose P0304 code on my Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug

1. Remove the engine cover if applicable.
2. Disconnect the ignition coil connector from the spark plug.
3. Unscrew the spark plug using a socket wrench.
4. Install a new spark plug, ensuring it is the correct type and gap.
5. Torque the spark plug to manufacturer's specifications (typically around 22 lb-ft).

3. Replace Ignition Coil (if necessary)

1. Remove the ignition coil by unscrewing it from the cylinder head.
2. Disconnect the electrical connector from the ignition coil.
3. Install the new ignition coil and reconnect the electrical connector.
4. Secure it back to the cylinder head.

4. Clean or Replace Fuel Injector (if necessary)

1. Remove the fuel rail to access the fuel injector.
2. Remove the fuel injector from the rail.
3. If cleaning, use an appropriate fuel injector cleaner; if replacing, install a new injector.
4. Reinstall the fuel rail and ensure all connections are tight.

5. Reassemble and Reconnect Battery

• Reattach any components removed during the repair.
• Reconnect the battery terminals.